CVE-2026-16876: CWE-306: Missing Authentication for Critical Function in NEC Corporation UNIVERGE IX-R/IX-V
Description
CVE-2026-16876 is a critical authentication bypass vulnerability in the WebGUI of NEC Corporation's UNIVERGE IX-R and IX-V series devices. This flaw allows an unauthenticated attacker to bypass authentication controls and execute arbitrary CLI commands by tampering with WebGUI messages sent to the device over the internet. The vulnerability has a high CVSS 4.0 score of 9.3, indicating it is remotely exploitable without user interaction and requires no privileges. No patch or remediation details are provided in the available data.
CVSS v4.0
Score 9.3critical
Affected software
NEC Corporation
UNIVERGE IX-R/IX-V
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-16876) involves missing authentication for a critical function in the WebGUI interface of NEC UNIVERGE IX-R and IX-V devices. An attacker can bypass authentication by manipulating WebGUI messages, enabling execution of arbitrary command-line interface commands remotely. The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function) and has a CVSS 4.0 base score of 9.3, reflecting its critical nature and ease of exploitation without privileges or user interaction.
Potential Impact
Successful exploitation allows an unauthenticated remote attacker to execute arbitrary CLI commands on affected NEC UNIVERGE IX-R and IX-V devices. This can lead to full compromise of the device, unauthorized control, and potential disruption of services or further network compromise. The vulnerability does not require any privileges or user interaction, increasing its risk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is provided in the available data. Until a patch is available, restrict access to the WebGUI interface from untrusted networks and monitor for suspicious activity targeting these devices.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- NEC
- Date Reserved
- 2026-07-24T04:35:25.244Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9e11e5acd9273b49b71572
Added to database: 09/07/2026, 01:22:45 UTC
Last enriched: 09/15/2026, 01:00:14 UTC
Last updated: 10/21/2026, 13:20:20 UTC
Views: 88
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